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With recreational marijuana now on sale in Colorado, Denver International and Colorado Springs airports have made it clear that travellers cannot bring pot through their facilities. Even medical marijuana is forbidden.

But the folks at the Colorado Springs airport, about 110 kilometres south of Denver, don't want travellers to dump bags of overlooked pot into the terminal trash bins. For that reason, the airport has installed "amnesty boxes."

A spokesman for the airport said the boxes will be monitored 24 hours a day, with Colorado Springs police responsible for emptying the boxes and destroying any drugs.

Colorado legalised recreational pot on New Year's Day, allowing it to be sold by licensed retailers. The highly-anticipated opening launched an unprecedented commercial cannabis market that Colorado officials expected would ultimately gross $US578 million ($648 million) in annual revenues, including $US67 million in tax for the state.